Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a classe da locomotiva com um tipo 0-4-0st?
 ###Tabelas: CREATE TABLE player_stats (player_stats_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Games Played INT, Rebounds INT, Assists INT, Steals INT, Blocks INT, Points INT) CREATE TABLE by_type (by_type_id AUTO_INCREMENT PRIMARY KEY, Rocket VARCHAR, Country VARCHAR, Family VARCHAR, Launches INT, Successes INT, Failures INT, Partial failures INT) CREATE TABLE seasonal_ratings_broadcast_history (seasonal_ratings_broadcast_history_id AUTO_INCREMENT PRIMARY KEY, Season INT, Network VARCHAR, Time slot VARCHAR, Season premiere VARCHAR, Season finale VARCHAR, Episode count INT, TV season VARCHAR, Season rank VARCHAR, Viewers (in millions) INT) CREATE TABLE sligo_leitrim_and_northern_counties_railway (sligo_leitrim_and_northern_counties_railway_id AUTO_INCREMENT PRIMARY KEY, Class VARCHAR, Type VARCHAR, Names VARCHAR, Quantity made VARCHAR, Manufacturer VARCHAR, Date made VARCHAR) CREATE TABLE northwest_germanic (northwest_germanic_id AUTO_INCREMENT PRIMARY KEY, Class VARCHAR, Part 1 VARCHAR, Part 2 VARCHAR, Part 3 VARCHAR, Part 4 VARCHAR)  
SELECT Class FROM sligo_leitrim_and_northern_counties_railway WHERE Type = 0-4-0st